Siberian Elm (Ulmus pumila) is a non-native tree that has been planted as an ornamental but has escaped and is now found in many disturbed areas. Colorado is considering adding it to the state's Noxious Weed List in fall 2022.
A single seed forms in a rounded, winged pod (samara) about 1/2 inch wide. The pods are arranged in large clusters.
Photo: Tom DeGomez, University of Arizona, Bugwood.org
The dark green leaves are simple, small (1-2 inch long), elliptical, with slightly toothed edges. The tops are smooth, the undersides can be lightly hairy. The leaf bases are slightly uneven. The venation is pronounced.
Photo: Steve Dewey, Utah State University, Bugwood.org
Bark is dark gray or brown. Somewhat rough and shallowly furrowed.
Photo: Robert Vidéki, Doronicum Kft., Bugwood.org
Branches are thin and break easily. They are arranged opposite with no terminal bud. Trees grow to 30-70+ feet tall. Trunks grow up to 3+ feet in diameter.
Photo: Patrick Breen, Oregon State University, Bugwood.org